27°C / 81°F
The measurements for the water temperature in San Juan, San Juan are provided by the daily satellite readings provided by the NOAA. The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users.
The graph below shows the range of monthly San Juan water temperature derived from many years of historical sea surface temperature data.
These average ocean temperatures for San Juan are calculated from several years of archived data.
Whilst sea temperatures for San Juan are as accurate as current data allows, there may be slight local and regional variations depending on conditions. Time of day and wind direction may have a temporary local effect as can water flows from neraby rivers.